#include<iostream>
using namespace std;
int s,m,n;
int cnt=1;
int main()
{
	cin>>s>>m>>n;
	while(1)
	{
		s-=m;
		if(s<=0)
		break;
		s+=n;
		
		cnt++;
	}
	cout<<cnt<<endl;
	return 0;
}
